Serena top, Halep second

Berlin - Serena Williams retained first place in the women's tennis rankings issued on Monday by the WTA while Simona Halep moved past injured Li Na into a career-high second place.

Williams, a semi-final loser last week in Montreal against her sister Venus Williams, tops the bill with 9 150 points ahead of Halep (6 785) and Li (6 565).

Halep has not played in several weeks but Li, who is nursing a knee injury, is losing points from last year in the rankings which take into account 52 weeks.

WTA Top 10:

1. Serena Williams, United States, 9 150 points

2. Simona Halep, Romania, 6 785

3. Li Na, China, 6 565

4. Petra Kvitova, Czech Republic, 5 930

5. Agnieszka Radwanska, Poland, 5 625

6. Maria Sharapova, Russia, 4 986

7. Angelique Kerber, Germany, 4 570

8. Eugenie Bouchard, Canada, 4 450

9. Jelena Jankovic, Serbia, 3 900

10. Victoria Azarenka, Belarus, 3 683